[Gluster-users] write performance is not good

[Mingfan Lu]

P.S.
  we use single 10000Mbps NIC. I found the networks bandwidth is not a
issue.


On Tue, Jan 28, 2014 at 4:49 PM, Mingfan Lu <mingfan.lu at gmail.com> wrote:

>
> Hi,
>   I have a  distributed and replica=3 volume (not to use stripe ) in a
> cluster. I used dd to write 120 files to test. I foundthe write performane
> of some files are much lower than others. all these "BAD" files are stored
> in the same three brick servers for replication (I called node1 node2 node3)
>
> e.g the bad write performance could be 10MBps while good performance could
> be 150Mbps+
>
> there are no problems about raid and networks.
> If i stopped node1 & node2, the write performance of "BAD" files are the
> similar to (even better) GOOD ones.
>
> One thing I must metion is  the raids of node1 and node2 are reformated
> for some reason, there are many self-heal activities to restore files in
> node1 and node2.
> Is the BAD write performance caused by aggresive self-heal?
> How could I slow down the self-heal?
> Any advise?
>
>
>
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